Question

What is -3(15-13k) answer

Answer 1

Well if you distribute the -3 to the 15 it becomes -45. Then, you distribute the -3 to the -13k. The double negatives end up marking a positive 39k. So it becomes -45+39k

Answer 2

If all you are trying to do is remove the brackets, then the answer is

-3*15 - (-3)(13k)

-45 + 39k